Mirrorless method for removing mold lines from eyeglass frames

Abstract

The application discloses a mirror-polishing method capable of removing mold joint lines of spectacle frames and belongs to the field of spectacle frame surface treatment. The mirror-polishing method capable of removing mold joint lines of spectacle frames comprises the following steps: adding bamboo particles or wood particles into a wooden roller for opening and practicing, adding dry grinding paste and spectacle frames after the opening and practicing is completed, and starting the wooden roller to rotate, so as to remove mold joint lines on the surface of the spectacle frames and repair the surface of the workpieces; performing ultrasonic cleaning on the spectacle frames after the mold joint lines are removed and the surface is repaired; adding grinding particles, water and nano grinding paste into a mirror-polishing roller, opening and practicing the grinding particles, then adding the spectacle frames cleaned to the mirror-polishing roller, and starting the mirror-polishing roller to rotate, so as to perform mirror-polishing treatment on the surface of the spectacle frames. The spectacle frames obtained through the treatment are completely free of the mold joint lines, the surface roughness is significantly reduced, and the glossiness and hardness are improved.

Description

Technical Field

[0001] This invention belongs to the field of surface treatment of eyeglass frames, specifically relating to a polishing-free method for removing parting lines on eyeglass frames. Background Technology

[0002] After injection molding, eyeglass frames will have parting lines on their surface. These lines are marks left on the molded plastic parts where the two parts of the mold meet during the injection molding process. They are formed when the molten plastic is squeezed into the parting line gap of the mold under high pressure and then cools and solidifies. The appearance of parting lines affects the aesthetics and wearing comfort, so surface treatment is required to remove them.

[0003] In existing technologies, the parting line is usually removed by hand scraping or filing when treating the surface of eyeglass frames. The disadvantage of this method is that it is time-consuming, labor-intensive, and requires a lot of manpower. Therefore, a polishing-free method is proposed to remove the parting line of eyeglass frames. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a polishing-free method for removing the mold line of eyeglass frames, thus solving the problems in the prior art.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A polishing-free method for removing the mold line on eyeglass frames includes the following steps:

[0007] S1, add bamboo or wood pellets to the wooden roller for kneading. After kneading, add dry polishing paste and eyeglass frame, start the wooden roller to rotate, remove the parting line on the surface of the eyeglass frame and repair the surface.

[0008] S2, ultrasonic cleaning of eyeglass frames after removing parting lines and surface repair;

[0009] S3. Add abrasive particles, water, and nano-abrasive paste to the polishing roller, and grind the abrasive particles to repair the surface smoothness. Then add the cleaned eyeglass frame and nano-abrasive paste to the polishing roller, and start the polishing roller to polish the surface of the eyeglass frame.

[0010] Furthermore, the eyeglass frame is made of nylon, plastic steel, PC, PPSU, or celluloid.

[0011] Furthermore, the bamboo or wood particles are made of square bricks with a size of 8mm × 8mm.

[0012] Furthermore, the step of processing the bamboo or wood pellets includes:

[0013] 1) Add bamboo or wood pellets to the wooden roller and add oil from the opened drum, then roll empty for 24 hours;

[0014] 2) Add dry polishing paste and run empty for 12 hours;

[0015] 3) Add the dry polishing paste again and roll empty for 12 hours.

[0016] Furthermore, the rotational speed of the wooden roller is 26-28 r / min.

[0017] Furthermore, the ultrasonic cleaning uses an ultrasonic frequency of 28 Hz and a cleaning temperature of 35-40℃.

[0018] Furthermore, the cleaning solution for ultrasonic cleaning includes purified water and dewaxing solution.

[0019] Furthermore, the grinding particles are high-alumina ceramic balls with a diameter of 2-6 mm.

[0020] Furthermore, the grinding particle refining step includes:

[0021] Add high-alumina ceramic balls, pure water, and nano-grinding paste to the polishing roller, and start the polishing roller to run empty for 48 hours.

[0022] Furthermore, the polishing roller is made of acrylic or polyurethane, and its rotation speed is 72-100 r / min. The beneficial effects of this invention are:

[0023] After bamboo pellets are processed, the present invention can directly feed the workpieces into a wooden roller in batches to process the mold line of the workpieces in batches, eliminating the need for complicated manual processing; and the workpiece surface can be repaired during the operation of the wooden roller, so that the workpiece surface can be repaired after operation or human damage. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a flowchart of the polishing-free smoothing method of the present invention. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1

[0028] like Figure 1 As shown, a polishing-free method for removing the mold line of eyeglass frames includes the following steps:

[0029] S1, add bamboo or wood pellets to the wooden roller for grinding, then add dry abrasive paste and eyeglass frame, start the wooden roller to rotate to remove the mold line and surface repair on the surface of the eyeglass frame;

[0030] In this embodiment, the eyeglass frame is made of nylon. Of course, in other embodiments, the eyeglass frame can also be made of plastic steel, PC (polycarbonate), PPSU (polyphenylene sulfone), or celluloid.

[0031] In this embodiment, a dry, left-right slow-speed roller (CPT-ZYMSGT) is used to remove the parting line. The equipment capacity is 100 liters * 4 sections = 400 liters; the equipment speed range is 26-28 r / min, and the power is 1.1KW. 20kg of bamboo particles and 500g of dry polishing paste are added to each roller.

[0032] In this embodiment, 8mm×8mm square bamboo particles are used, and the material is bamboo.

[0033] The steps for processing bamboo grains include:

[0034] 1) Add 20kg of bamboo particles and 500g of opened oil to the wooden drum and roll it empty for 24 hours (speed is 28r / min);

[0035] 2) Add 500g of dry polishing paste and roll empty for 12 hours (speed 28r / min);

[0036] 3) Add 500g of dry polishing paste and roll empty for 12 hours (speed 28r / min).

[0037] After the bamboo particles are processed, add 500g of dry grinding paste and manually break up the bamboo particles; then add the eyeglass frame and roll it at 28r / min for 48 hours to remove the mold line.

[0038] Among them, the opening oil is a by-product of petroleum refining, namely mineral oil. It is mainly used to wet the wood particles in the drum to achieve surface lubrication and increase adsorption, while removing burrs from the surface of bamboo particles to avoid affecting the workpiece and increasing the adsorption capacity of dry grinding paste.

[0039] S2, ultrasonic cleaning of the eyeglass frames after removing the mold lines;

[0040] In this embodiment, an ultrasonic cleaning device is used, including 36 transducers, with an ultrasonic frequency of 28 Hz and a cleaning temperature of 35-40℃ (40℃ in this embodiment); the cleaning solution includes 100 kg of pure water and 3 kg of special dewaxing solution.

[0041] In this embodiment, the wax remover can effectively remove the polishing paste and wood chips remaining on the surface after dry roller polishing, without damaging the substrate.

[0042] S3. Add abrasive particles, water, and nano-abrasive paste to the polishing roller and grind the abrasive particles. Then add the cleaned eyeglass frame to the polishing roller and add nano-abrasive paste again. Start the polishing roller to rotate and polish the surface of the eyeglass frame.

[0043] In this embodiment, a multi-layer wet polishing machine (equipment model CPT-MPLG) is used to polish the eyeglass frames to increase their surface brightness and hardness. The equipment capacity is 4 layers * 10 grids * 9L = 360 liters. The equipment speed range is 72-100r / min. The polishing rollers are made of acrylic or polyurethane material and have a power of 1.7KW.

[0044] The grinding particles are high-alumina ceramic balls with a diameter range of 2-6 mm. In this embodiment, the high-alumina ceramic balls have two diameter specifications: 2 mm and 4 mm.

[0045] The nano-abrasive paste comprises the following raw materials in weight percentages:

[0046]

[0047] The rest is deionized water.

[0048] The abrasive particles are one or more combinations of alumina particles, silica particles, silicon carbide particles, and cerium oxide, with a particle size of 100-500 nm; these ensure uniform abrasive grinding without damaging the substrate. The dispersant is sodium dodecylbenzenesulfonate, ensuring uniform dispersion of the abrasive particles. The brightening agent is silicone resin, polyurethane resin, or polyamide resin, forming a protective film. The pH adjuster is citric acid or ammonia, adjusting the pH of the polishing solution to 6-8.

[0049] In this embodiment, the nano-abrasive paste comprises the following raw materials by weight percentage: 25% silicon carbide particles (200nm), 15% sodium dodecylbenzenesulfonate, 5% polyurethane resin, 1% citric acid, and the remainder being deionized water; the pH is 7.

[0050] In this embodiment, each smoothing roller contains 1.5 kg of purified water, 2 kg of 2 mm high-alumina ceramic balls, 2.5 kg of 4 mm high-alumina ceramic balls, and 200 g of nano-abrasive paste.

[0051] The steps for grinding particles include:

[0052] Add 2kg of 2mm high-alumina ceramic balls and 2.5kg of 4mm high-alumina ceramic balls to each roller, along with 1.5kg of purified water and 200g of nano-abrasive paste. Start the rollers to run empty (at a speed of 100r / min) for 48 hours. The purpose is to repair the surface of the high-alumina ceramic balls and make it smooth.

[0053] After the grinding particles are started, 200g of nano-grinding paste needs to be added each time for polishing.

[0054] Example 2

[0055] In this embodiment, performance tests were conducted on the final nylon eyeglass frame obtained from Example 1 and the original eyeglass frame (injection molded). The test items and test procedures are as follows:

[0056] 1) Surface roughness: The surface roughness was measured at five key points, including the nose pad and the inner side of the temple, using a white light interferometer (refer to GB / T 29552-2013), and the average value was taken.

[0057] 2) Presence or absence of parting line: Visually inspect for the presence or absence of parting line;

[0058] 3) Surface gloss: Measured using a gloss meter with an incident angle of 60° (compliant with GB / T 9754-2007).

[0059] 4) Surface hardness: The test standard procedure is as follows (ASTM D2240).

[0060] The surface must be smooth, free of bubbles / scratches, and ≥6mm thick (to avoid substrate effect); environmental temperature and humidity control (23±2℃, 50±5% RH) is required to prevent nylon from absorbing moisture and affecting the results. Workpiece standard selection: thickness ≥2mm, flat area ≥10×10cm (to prevent edge effect); operating steps include:

[0061] 4.1) With the pressure needle in vertical contact with the surface, apply a pressure of 1 kgf and take the reading after 15 seconds.

[0062] 4.2) Perform multiple tests (at least 5 times) and take the average value, with a spacing of ≥6mm.

[0063] The test results are shown in Table 1 below:

[0064] Table 1. Performance test results of nylon eyeglass frames before and after polishing.

[0065]

[0066] As can be seen from Table 1, after polishing, the eyeglass frame completely eliminated the parting line, significantly reduced the surface roughness, and improved the gloss and hardness.

[0067] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A polishing-free method for removing the parting line of eyeglass frames, characterized in that, Includes the following steps: S1, add bamboo or wood pellets to the wooden roller for kneading. After kneading, add dry polishing paste and eyeglass frame, start the wooden roller to rotate, remove the parting line on the surface of the eyeglass frame and repair the surface. S2, ultrasonic cleaning of eyeglass frames after removing parting lines and surface repair; S3. Add abrasive particles, water, and nano-abrasive paste to the polishing roller, and grind the abrasive particles to repair the surface smoothness. Then add the cleaned eyeglass frame and nano-abrasive paste to the polishing roller, start the polishing roller to rotate, and polish the surface of the eyeglass frame. The bamboo or wood particles are made of square bricks with a size of 8mm × 8mm; The steps for processing the bamboo or wood pellets include: 1) Add bamboo or wood pellets to the wooden roller and add oil from the opened drum, then roll empty for 24 hours; 2) Add dry polishing paste and run empty for 12 hours; 3) Add the dry polishing paste again and run it empty for 12 hours; The grinding particles are high-alumina ceramic balls with a diameter of 2-6 mm. The steps for refining the abrasive particles include: Add high-alumina ceramic balls, pure water, and nano-grinding paste to the polishing roller, and start the polishing roller to run empty for 48 hours.

2. The method for removing the mold line of an eyeglass frame without polishing according to claim 1, characterized in that, The eyeglass frames are made of nylon, plastic steel, PC, PPSU, or celluloid.

3. The method for removing the mold line of an eyeglass frame without polishing according to claim 1, characterized in that, The rotational speed of the wooden roller is 26-28 r / min.

4. The method for removing the mold line of an eyeglass frame without polishing according to claim 1, characterized in that, The ultrasonic cleaning process uses an ultrasonic frequency of 28 Hz and a cleaning temperature of 35-40℃.

5. The method for removing the mold line of an eyeglass frame without polishing according to claim 1, characterized in that, The ultrasonic cleaning solution includes purified water and wax remover.

6. The method for removing the mold line of an eyeglass frame without polishing according to claim 1, characterized in that, The smoothing roller is made of acrylic or polyurethane and rotates at a speed of 72-100 r / min.

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